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Which fault may still permit communication on some vehicles?

  • A.A missing terminator only
  • B.A single line fault, which some controllers tolerate by reverting to single wire operation at a reduced immunity
  • C.One line shorted to earth or open circuit
  • D.Both lines shorted together, which preserves the signal sufficiently for the modules to continue communicating

Answer: C

Fault tolerant transceivers can run on one line with reduced noise immunity. The last option describes exactly that capability, which makes it a correct and more specific statement. A missing terminator also permits communication. Checking which component actually carries the load settles most questions of this kind at once. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.

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